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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

31727 results found.

  1. GRB 080727C: Suzaku WAM observation of the prompt emission
  2. GRB 080727B: IR photometry
  3. GRB 080727A: Early IR observations
  4. GRB 080727C: TAROT Calern observatory optical observations
  5. GRB 080727B: KAIT photometry and an early lightcurve break
  6. GRB 080727B: GROND redshift limit
  7. GRB 080727C, Swift-BAT refined analysis
  8. GRB 080727C: Swift/UVOT Upper Limits
  9. Konus-Wind observation of GRB 080727B
  10. GRB 080727C: Swift XRT refined analysis
  11. GRB 080727C: Liverpool Telescope observations
  12. GRB 080727A: VLT upper limits
  13. GRB 080727B: REM NIR afterglow prompt detection
  14. GRB080727C: RTT150 optical observations
  15. GRB 080727B: Swift/UVOT Upper Limits
  16. GRB 080727B: Swift-XRT refined analysis
  17. GRB 080727B, Swift-BAT refined analysis
  18. GRB 080727A, Swift-BAT refined analysis
  19. GRB 080727A: Swift-XRT refined analysis
  20. GRB080727A: Swift/UVOT Upper Limits
  21. GRB 080727B: KAIT observations
  22. GRB 080727B: REM prompt observations
  23. GRB 080725, Swift-BAT refined analysis
  24. GRB 080723A: optical upper limit
  25. GRB080723B: Swift/UVOT Upper Limits
  26. GRB 080725: REM prompt observations
  27. Konus-Wind observation of GRB 080723B
  28. ATCA radio upper limit on GRB 080723B
  29. GRB 080723A: Swift/UVOT Upper Limits
  30. VLA radio upper limit on GRB 080721
  31. GRB 080723B - correction to flux conversion factor
  32. GRB 080723B - Swift-XRT refined analysis
  33. GRB 080723B - Swift-XRT position
  34. GRB 080723, Swift-BAT refined analysis
  35. GRB 080723B: AGILE GRID and MCAL results
  36. GRB 080723A: Swift-XRT refined analysis
  37. GRB 080723B: Detection and Localization by SuperAGILE
  38. GRB 080721 : Lulin 2nd optical follow-ups
  39. GRB 080721: OA fading and redshift
  40. TNG/DOLORES redshift for GRB080721
  41. GRB 080721: UVOT Follow-Up Observations
  42. Konus-Wind observation of GRB 080721
  43. GRB 080721: Swift-XRT refined analysis
  44. GRB 080721, Swift-BAT refined analysis
  45. GRB 080721: Swift/UVOT Photometric Redshift
  46. GRB 080721 : Lulin Optical follow-ups
  47. GRB 080721: Swift-XRT correct position
  48. Retraction of Swift Trigger 317393
  49. GRB 080714: GROND confirmation of the optical/NIR afterglow
  50. Konus-Wind observation of GRB 080714
  51. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  52. GRB 080714: Swift-XRT refined analysis
  53. GRB 080714: Swift-BAT refined analysis
  54. GRB 080702A: optical upper limit
  55. GRB 080603A: CrAO optical observations
  56. GRB 080603B: optical observations in MAO
  57. GRB 080603B: optical observations in CrAO
  58. GRB 080710: Optical observation with MITSuME Okayama
  59. GRB 080710: TLS observations, steepening afterglow decay
  60. GRB 080702B: Swift XRT confirmation of the afterglow
  61. GRB 080710, Swift-BAT refined analysis
  62. GRB 0800707: optical observations
  63. GRB 080710: Rapid PROMPT Observations
  64. GRB 080710: Swift-XRT refined analysis
  65. GRB080710: Swift/UVOT observations
  66. GRB 080710: Faulkes Telescope North observations
  67. GRB 080710: Gemini spectroscopy and probable redshift
  68. UVOT white band observations of GRB080710
  69. GRB 080710: REM afterglow confirmation & brightening
  70. GRB 080710: KAIT OA candidate
  71. GRB 080707: possible break in the X-rays
  72. New Swift-XRT GRB products available online.
  73. GRB 080707: GROND Confirmation of the Optical Afterglow
  74. UVOT observations of GRB080707
  75. GRB 080707, Swift-BAT refined analysis
  76. GRB 080707: Swift XRT refined analysis
  77. GRB 080707: VLT redshift
  78. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  79. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  80. GRB 080703: GROND Upper Limits
  81. GRB 080702B: GROND Upper Limits
  82. GRB 080703: Swift-XRT refined analysis
  83. GRB 080703: UVOT Follow-Up Observation
  84. GRB 080703: VLT observations of the afterglow
  85. GRB 080703, Swift-BAT refined analysis
  86. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  87. No radio detection from the short GRB 080702A
  88. GRB 080702b: LCO optical observations
  89. Swift/UVOT observation of GRB080702A
  90. GRB 080702B: Swift XRT and UVOT observations
  91. GRB 080625: Suzaku WAM observation of the prompt emission
  92. GRB 080702A: MITSuME Akeno optical upper limits
  93. GRB 080701A: Early RAPTOR optical limits
  94. Swift Trigger 315630: Swift/UVOT Upper Limits
  95. GRB 080702A, Swift-BAT refined analysis
  96. GRB 080702A: Swift-XRT Team refined analysis
  97. Swift Trigger 315630: TLS R-band observation
  98. Swift Trigger 315630: Probably not a GRB
  99. GRB 080701: Swift-XRT refined analysis
  100. GRB 080701A, VATT optical upper limit

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